From: "H. Peter Anvin (Intel)" <hpa@xxxxxxxxx>
On x86, external interrupts can be categorized into two groups:
1) System interrupts
2) External device interrupts
All external device interrupts are directed to the common_interrupt(),
which, in turn, dispatches these external device interrupts using a
per-CPU external device interrupt dispatch table vector_irq.
To handle system interrupts, a system interrupt handler table needs to
be introduced. This table enables the direct dispatching of a system
interrupt to its corresponding handler. As a result, a software-based
dispatch function will be implemented as:
void external_interrupt(struct pt_regs *regs)
{
u8 vector = regs->vector;
if (is_system_interrupt(vector))
system_interrupt_handlers[vector_to_sysvec(vector)](regs);
else /* external device interrupt */
common_interrupt(regs);
}
Signed-off-by: H. Peter Anvin (Intel) <hpa@xxxxxxxxx>
Co-developed-by: Xin Li <xin3.li@xxxxxxxxx>
Tested-by: Shan Kang <shan.kang@xxxxxxxxx>
Signed-off-by: Xin Li <xin3.li@xxxxxxxxx>
---
Changes since v8:
* Remove junk code that assumes no local APIC on x86_64 (Thomas Gleixner).
Changes since v5:
* Initialize system_interrupt_handlers with dispatch_table_spurious_interrupt()
instead of NULL to get rid of any NULL check (Peter Zijlstra).
---
arch/x86/kernel/traps.c | 50 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 50 insertions(+)
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 49dd92458eb0..e430a8c47931 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -1488,6 +1488,56 @@ DEFINE_IDTENTRY_SW(iret_error)
}
#endif
+#ifdef CONFIG_X86_64
+
+static void dispatch_table_spurious_interrupt(struct pt_regs *regs)
+{
+ dispatch_spurious_interrupt(regs, regs->vector);
+}
+
+#define SYSV(x,y) [(x) - FIRST_SYSTEM_VECTOR] = y
+
+static system_interrupt_handler system_interrupt_handlers[NR_SYSTEM_VECTORS] = {
+ [0 ... NR_SYSTEM_VECTORS-1] = dispatch_table_spurious_interrupt,
+#ifdef CONFIG_SMP
+ SYSV(RESCHEDULE_VECTOR, dispatch_table_sysvec_reschedule_ipi),
+ SYSV(CALL_FUNCTION_VECTOR, dispatch_table_sysvec_call_function),
+ SYSV(CALL_FUNCTION_SINGLE_VECTOR, dispatch_table_sysvec_call_function_single),
+ SYSV(REBOOT_VECTOR, dispatch_table_sysvec_reboot),
+#endif
+
+#ifdef CONFIG_X86_THERMAL_VECTOR
+ SYSV(THERMAL_APIC_VECTOR, dispatch_table_sysvec_thermal),
+#endif
+
+#ifdef CONFIG_X86_MCE_THRESHOLD
+ SYSV(THRESHOLD_APIC_VECTOR, dispatch_table_sysvec_threshold),
+#endif
+
+#ifdef CONFIG_X86_MCE_AMD
+ SYSV(DEFERRED_ERROR_VECTOR, dispatch_table_sysvec_deferred_error),
+#endif
+
+#ifdef CONFIG_X86_LOCAL_APIC
+ SYSV(LOCAL_TIMER_VECTOR, dispatch_table_sysvec_apic_timer_interrupt),
+ SYSV(X86_PLATFORM_IPI_VECTOR, dispatch_table_sysvec_x86_platform_ipi),
+# ifdef CONFIG_HAVE_KVM
+ SYSV(POSTED_INTR_VECTOR, dispatch_table_sysvec_kvm_posted_intr_ipi),
+ SYSV(POSTED_INTR_WAKEUP_VECTOR, dispatch_table_sysvec_kvm_posted_intr_wakeup_ipi),
+ SYSV(POSTED_INTR_NESTED_VECTOR, dispatch_table_sysvec_kvm_posted_intr_nested_ipi),
+# endif
+# ifdef CONFIG_IRQ_WORK
+ SYSV(IRQ_WORK_VECTOR, dispatch_table_sysvec_irq_work),
+# endif
+ SYSV(SPURIOUS_APIC_VECTOR, dispatch_table_sysvec_spurious_apic_interrupt),
+ SYSV(ERROR_APIC_VECTOR, dispatch_table_sysvec_error_interrupt),
+#endif
+};
+
+#undef SYSV
+
+#endif /* CONFIG_X86_64 */
+
void __init trap_init(void)
{
/* Init cpu_entry_area before IST entries are set up */
--
2.34.1
